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E. A. OVENSHIRE. OULTIVATOR.

No.598,05'7. Patented Jan. 25,1898.

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UNITE STAT S PATENT FFlCE.

ELIJAH A. OVENSHIRE, or DETROIT, MICHIGAN, ASSIGNOR To THE AMERICANI-IARROW COMPANY, or SAME PLACE.

cu LliVATO R.

SPEGIFIGATIONtorming part of Letters Patent No. 598,057,

Application filed March 19,1897.

the following is a specification, reference being had therein to theaccompanying drawmgs.

The invention relates to cultivators, and particularly to what is calleda spring-trip for the cultivator tooth or sleeve; and the inventionconsists in they construction of such a spring-trip, whereby it issimplified, cheapened, and made compact.

To this end the invention consists in the arrangement, construction, andcombination of the various parts, all as more fully hereinafterdescribed.

In the drawings, Figure l is a side elevation of a drag-bar or standardof a cultivator, showing my improvement applied thereto and showing infull and dotted lines the normal and tripped positions of the parts.Fig. 2 is a similar view to that shown inFig. 1, except that it is insection on a line drawn beside the standard. Fig. 3 is a frontelevation. Fig. 4 is a perspective view of the spring, detached, of thedrag-bar.

A is the vertical portion, which I shall refer to hereinafter as thestandard for convenience of reference.

C is the shovel-carrying member and what is usually termed the sleeve,being slotted on its rear face to engage upon the lower end of thestandard and be pivoted thereto at the lower end of the standard upon abolt D. In the construction shown and which I deem the preferableconstruction this bolt passes throughsubstantially the middle part ofthe sleeve. The lower end of the sleeve carries the shovel E, and theupper end contacts with the standard at some point to act as a stop. Ihave shown the stop in this case formed by a bolt F, with which thehooks G on the upper end of the sleeve engage.

H is a lever or arm extending rearwardly from about the fulcrum-point ofthe sleeve,

preferably being pivoted on the bolt D and ted January 25, 1898.

Serial No. 628,287. (No model.)

with the standard by means of thetoggle levers I and J. The toggle-leverJ is a double lever-what is, formed in two separate partsand is pivotedat its upper end on a bolt F. It is separated from the standard by theflanges K a sufficient distance to form a re 'cess or socket into whichthe hooks G may engage in the operation of the device.

The parts of'the lever J are provided with outwardly-projectingtrunnions L, around which the coil-sprin g M is engaged, the springhaving an arm 0, which bears against the standard, and an arm, cl, whichbears against the toggle-levers.

O is an adjusting-screw passing through a toggle-lever and abuttingagainst the standard, so as to determine the angle at which these leversusually extend and thereby determine'the amount of power required totrip the device.-

The operation of the machine is as follows: The toggle-levers beingarranged with their pivotal points slightly out of line if a sufficientobstacle is encountered by the cultivator blade to overcome theresistance of the toggle connection and its spring the blade will fallbackward against the tension of the spring, forcing the levers up intothe position shown in Fig. 1 in dotted lines and allowing the blade toswing backward to clear the obstacle. As soon as the obstacle has beenpassed the spring will force the parts back into their normal, position.

With my construction the ordinary type of sleeve designed forfriction-trip or a wooden brake may be sent out with the cultivator, andmy improved spring-trip may be applied as an attachment thereto. In casea frictiontrip is desired the toggle-levers and the lever H may beremoved, and in place of the bolt F a clamping-bolt may be used, thisclampingbolt producing friction upon the hooks G suf ficient to lock thesleeve, except in case too great strain is brought upon the shovel, or awooden pin may be driven through the hole Q for the same purpose. Thenif it is desired to use my improved spring-trip .itis simply necessaryto attach the parts II, I, and J and the spring and the device iscomplete. It will be seen that by this particular arrangement ofconnecting the toggle-levers from a lever extending rearwardly from thefulcrum-point 0f the sleeve to a point on the vertical portion of thedrag-bar the entire spring-trip is in the rear of the standard and thatit is much more compact and simple than in devices in which theconnection is made to the horizontal portion of the drag-bar.

What I claim as my invention is 1. In a cultivator, the combination of astandard, comprising a vertical portion, a

sleeve pivoted to the end of the vertical portion of the standard, arearwa'rdly-extending lever pivoted on the pivot of the sleeve andseparable therefrom, and a spring-backed toggle lever trip, connectingfrom the rearwardly-extending lever, back to the vertical portion of thestandard.

2. In a cultivator, the combination with the standard, having a verticalportion,ofa sleeve pivoted centrally to the lower end of the standard,its upper portion acting as a stop for thesleeve, a lever extendingrearwardly from the pivotal point of the sleeve, and a spring backedtoggle-lever connection from this rearward lever, back to the standardat the upper end of the sleeve.

3. In a cultivator, the combination with th standard, a sleeve pivotedto the lower end thereof, a lever, pivoted at the pivotal point of thesleeve and extending rearwardly therefrom, a toggle-lever connectionfrom its end back to the standard, and a spring coiled centrally aboutbearings on the upper pivotal point of the toggle-lever, and having armsbearing respectively on the standard and toggle-lever.

4. In a cultivator, the combination of the standard, the sleeve pivotedat its middle and having a hook at the upper end, a rearwardlyextendinglever pivoted on the pivotal bolt of the sleeve, a toggle-leverconnection between this 'rearwardly extending lever and the standard atthe top of the sleeve, the upper lever of the toggle being a doublelever, extending on each side of the standard, and flanges on theselevers forming a recess for the hook on the sleeve, substantially asdescribed.

In testimony whereof I aiiix my signature in presence of two witnesses.

ELIJAI-I A. OVENSHIRE. Witnesses:

JAMES WHITTEMORE, OTTO F. BARTHEL.

